Electromagnetic relay



Sept. 22, 1964 R. NITSCH ETAL ELECTROMAGNETIC RELAY 2 Sheets-Sheet 1Filed March 26, 1962 Fig A P 1964 R. NITSCH ETAL 3,150,244

ELECTROMAGNETIC RELAY Filed March 26, 1962 2 Sheets-Sheet 2 UnitedStates Patent 3,150,244 ELECTROMAGNETIC RELAY Rudolf Nitsch, Willy Lohs,Friedrich Sommer, and Hugo Angcrmaier, all of Munich, Germany, assignorsto Siemens 5; Halske Aktiengesellschaft Berlin and Munich, Munich,Germany, a corporation of Germany Filed Mar. 26, 1962, Ser. No. 183,345Claims priority, application Germany Mar. 29, 1961 16 Claims. (Cl.=20098) The invention disclosed herein is concerned withelectromagnet-ic relays. The object of the invention is to provide arelay of simple construction, comprising simple parts, and thus beingparticularly adapted for automatic production.

This object is realized by the provision of a relay comprising a platein which is inserted at least one core member of pin-like configuration,extending perpendicularly to the plane of the plate, such core memberserving as an electrical conductor as well as a magnetic conductor, andan armature which is magnetizable and also serves as an electricalconductor, such armature cooperating with at least one core member toexecute circuit switching relay functions.

The individual components required for the construction of the relay canbe easily fabricated. The combination of the components as contemplatedby the invention adapts the relay particularly to serve the intendedpurpose. The connection between the plate and at least one cover membercan be particularly eifeoted in the automatic fabrication, since thesurface of the plate provides accurate reference areas for the properdisposition of the component parts. This is also true so far as theelectrically conductive armature is-concerned, the accurate position ofwhich, with respect to the core member and the plate, can be definitelydetermined in automatic fabrication, thereby also determining therequred contact spacing.

The armature is suitably constructed as a flat component which is inparticularly advantageous manner arranged substantially in parallel withthe plate, thereby obtaining a compact relay structure. The core memberis in such a case advantageously inserted in the plate so that its endwhich faces the armature is substantially flush with the correspondingside of the plate or protruding only slightly therefrom, thuscontributing further toward a compact structure of the relay.

While the plate may be made of insulating material, for example, ceramicmaterial, it is particularly advantageous, especially so far as thefabrication of the relay is concerned, to employ a metallic plate. Sucha plate is mechanically strong and adapted to be subjected to therelatively great stresses occurring in automatic fabrication, withoutaffecting its dimensions, and permitting to define Wth greatest accuracythe reference areas which are available for the construction of therelay.

The core member may be secured in the plate by sealing means made ofglass or materials having similar properties, advantageously employingfor this purpose pressure fusing technique. The connection between theplate and the core means may thus be made gastight in simple mannor,which is of advantage in the further construction of the relay, as willbe presently explained more in detail. Securing of the core means in theplate in this manner has, in the case of a metal plate, the advantage ofproviding a satisfactory electrical insulation between the correspondingparts. The fused seals are very strong and withstand stresses that mayoccur incident to the automatic fabrication operations.

It may be mentioned at this point that it is known to secure cores ofelectromagnetic relays by fused glass seals formed under pressure. Thistechnique has been applied 3,150,244 Patented Sept. 22, 1964 in a knownarrangement employing bushings which are inserted cores. The bushingsare components requiring for their production a more elaborate operationthan is required for the plate employed in the present invention.Moreover, the bushing does not provide the favorable reference areas forthe construction of the relay. The known relay also requires elaboratecontact means controlled by the armature, which call for a relativelylarge space.

The core or cores to be secured in the plate by glass seals areadvantageously widened at the end thereof at which they are inserted inthe plate. This simplifies the fabrication in which annular glass bodiesare placed upon the cores and surrounding the latter within the range ofcorresponding openings formed in the plate, the connection between theparts being thereupon secured by heating. The widening of the respectivecores assures the glass parts in accurate position with respect theretoand prevents spreading of the glass in fluid condition to the free endof the core or to the surrounding area of the plate, thus avoidingcontaminations which would have to be removed subsequently, since thefree end of the core forms a contact in cooperation with the armature ofthe relay made according to the invention.

The requirement is being posed for some time, that the armature,especially when it is also utilized as an electrical conductor, shouldbe disposed in a closed or sealed chamber. In a relay made according tothe invention, such a chamber can be provided in simple manner byplacing a cover upon the plate, such cover, in cooperation with theplate, defining the closed space or chamber for the armature. Forexample, the plate may be provided with up wardly drawn rim upon whichis placed a plane plate. However, the plate is advantageously formedplane and the cover is provided with angularly bent rim and positionedupon the plate. The cover may be removably connected with the plate. Itis, however, of advantage to provide for a fixed connection between thecover and the plate, which is produced in automatic fabrication withoutdiificulties, for example, by welding or soldering a metallic cover to ametallic plate.

The cover is advantageously connected with the plate in hermeticallytight manner, so that the armature can be arranged within a space orchamber which is evacuated or filled with a protective gas. Such ahermetically tight connection is easily effected by welding or solderingthe parts together. The cover may be provided in known manner withsuctionstubs for effecting evacuation and subsequent filling of theenclosed space with protective gas, whereupon such stubs are sealed. Itis understood, of course, that the core or cores must be projectedthrough the plate in gastight manner.

The cover may be provided with an annular flange-like rim for engagementwith a marginal zone of the plate. Such construction of the cover isparticularly suitable for welding or soldering the parts together sincethey are in engagement over relatively large portions thereof. Guidemeans or positioning means are advantageously provided on both parts tofacilitate the automatic operation applied for effecting the connectiontherebeween, such guide means determining the mutual positions of theparts.

Such guide means may be realized in simple manner by forming an annulardepression along the marginal zone of the plate, and disposing in suchdepression the marginal portion of the cover, that is, the previouslymentioned flange formed on the cover.

The end of the core which cooperates for'con-tact making with thearmature is advantageously formed spherically. The substantially flatarmature will in this manner form a practically constant accuratelydefine contact engagement with the core, regardless of the angularposition olfers an accurate reference area. v j ture spring to'be weldedto'the cover, the armature will 7 9 thereof with respect to the core,without having to resort to adjusting operations which increase thecosts.

Upon the part of at least one core which projects from the side of theplate facing away from the armature, is provided at least onemagnetizing winding. Such arrangement of the winding is easily effectedin automatic operation. I

In the event that a plurality of cores are inserted in the plate, suchcores are magnetically connected by means of a yoke plate extendingparallel therewith. This yoke plate may be provided with holes throughwhich the cores project, requiring, of course, care to provide forelectrically insulating the parts with respect to one another.

In a very simple embodiment, the relay may beconstructed with only'onecore which is inserted in a metallic plate, the armature therebyeffecting contact between the plate and the core. In a similarly simpleembodiment, employing a metallic cover, the armature which extendsbetween the cover and the single core, effects contact betweenthe-parts.

A relay constructedin the above described manner requires relativelyvery little space, since particular contact devices are eliminated. T econstruction of the relay with a hermetically tightly enclosed space orchamber 7 for the armature results in the great advantage of requiringfor the enclosed space only one single lead-through, namely, for thecore, thus reducing to the lowest possible number the places at whichleakage might occur.

The armature is advantageously journalled by means of a spring. In thelast two' described simple embodiments of the invention, an electricallyconductive connection between the armature and the plate or 'cover, maybe produced by such spring in simple manner by connecting the betweenthe plate and the cover, by the armature,'the

parts are advantageously mutually arranged so that the core areacooperating with the armature, lies flush with the surrounding platesurface. The advantages resulting therefrom reside not only in thecontacting aspects, but also in the fabrication of the relay, that'is,in this instance, in the connection between the plate and the core. 7 i

In automatic operation, the desired'position of thecore in the plate maybe readily obtained by. the use of a planar backing member in alignmentwith the core and the plate.

The armature comprises two mutually independent parts lying alongsideone another and fastened preferably to respective extensions of aspring,jthus resulting in a dual contact and therewith in improvedcontacting operation. v

The cover is advantageously providedwith an inwardly extending boss forengagement'with the armature so as to determine the normal positionthereof. The spring for'holding the armature 'may be fastened to such acover, for example, by welding.

A relay made according to the invention and equipped with such a coveroffers particular advantages which adapt it for automaticfabrication.These advantages will now be briefly described. a g

Theplate surface upon which is positioned thej'cover Assuming thearmaengage the previously mentioned boss which extends inwardlytherefrom. Thespring may beused in completely plane condition withoutany pretensioningthoreof. There; are accordingly two components, namely;the plate carrying the core which is inserted therein, such'core lying"for, cooperation with the armature in a plane which is disposed in anaccurate relative position with respect to the plate surface, and thecover with the armature, and such components are to be connected withone another. Upon connecting these components with one another, the mostimportant parameter of the relay, namely, the spacing between thecoreand the armature, which is equivalent to the contact spacing,depends solely on one single dimension, that is, the spacing between theplate and the cover part which extends parallel therewith. Thisdimension can be maintained with great accuracy, for example, uponforming the cover with angularly bent rim which lies in engagement withthe plate. The spacing between the core and the armature willaccordingly automatically result with the required great accuracy uponconnecting the respective components with each other.

The boss which projects inwardly of thecover may be made in the form ofan indentation, the depth of which can be accurately fixed according toa predetermined dimension. n

However, the boss projecting inwardly of the cover may also be formed byan electrically conductive pin extending through the cover, resulting inthe possibility of utilizing such pin, in cooperation with the armature,as a normal or break contact. It is likewise possible to make the pin ofmagnetically conductive material in combination with a cover made ofnon-magnetic material, for example, of brass. Such construction willoffer the possibility of arranging for a normal contact, and will resultin the further advantage of placing upon the pin at least one energizingwinding for additionally controlling the operation of the armature.

Upon constructing the relay with only one core which is inserted in theplate, the condition, insofar as the flow of the flux is concerned,can'be improved by arranging at least one flux conducting memberextending in parallel with the part of the core .on which is providedthe energizing winding, and magnetically connecting such member with thecore by a yoke plate extending parallel therewith. The flux conductingmember and theyoke plate may be made of one piece, for example, in theform of a pot-like member which embraces the energizing winding. i

As previously mentioned, there may be provided a yoke plate, extendingin parallel to the core plate, and having holes or openings formedtherein for cores which extend therethr'ough. The free ends of the coresare in such a case so arranged that they may be utilized as contactterminal pins. The relay may then be plugged, for example, into holesformed in a printed circuit plate so as to form connections with thecircuitry, and the ends of these corepin-terrninals can be soldered tocorresponding parts of the circuit, thereby fastening the reiay inposition on the plate of the printed circuit. The relay is very light inweight owing to the compact structure thereof, and such fastening willtherefore fully suffice and obviate separate fastening means whichnormally would otherwise be re quired.

In the event that contact elements, serving only as'elec- W tricalconductors and cooperating with the armature, are

required in addition to the electrically and magnetically conductive.core which is inserted in the plate and cooper-' ate with the armature,such additional contact elements can be advantageously provided ontheplate which carries the'core. Such'contact elements are advantageouslyinserted in the plate, extending in parallel with the core and being ofthe same length andconliguration as the core.

A relay constructed in this manner therefore offers, insofar asautomatic fabrication is concerned, all'the advantages observed inconnection with a relay having core means operating electricaland alsoas magnetic condue tors. In an automatic fabrication operation, thepositions of the additional contact elements may be-related to thereferenceareas of the, plate surface with'the same accuracy as that ofthe core, since these contact elements are inserted in thesame plate asthe core. The devices required for the insertion or placement of thecontact elements can therefore be constructed in a similar manner as thedevices used for the insertion or placement of cores.

The relay conducted in accordance with the invention is particularlyadapted for combination with a plurality of like relays to form a relayset. A relay set may thus be constructed upon a common plate, retainingthereby, insofar as the fabrication is concerned, all advantages oiferedby the individual relay. A relay set with very compact space savingstructure may be provided in this manner.

Moreover, such a relay set may be built with parts arranged in variousmanner. Thus, the cores of the various relays can be placed or insertedin a plate with relatively large area, in desired distribution, forexample, in a plurality of rown disposed one in back of the the other.It is, however, also possible to construct the relay set in the mannerof a known relay strip or bar, that is, with a plurality of relaysdisposed one alongside the other.

A further structural simplification of the relay set according to theinvention may be achieved, in connection with relays having closedchambers for the respective armatures, formed by the covers incooperation with the corresponding plates, by combining in a commoncomponent the covers of at least some of the relays.

Still another simplification is achieved by likewise combining in acommon component at least some of the yoke plates, cooperativelyassociated with the respective relays, extending parallel with thecorresponding core plates and magnetically connecting the cores.

Upon using relays with spring-journalled armatures, at least some of therelays may be journalled on a spring band or strip which is commonthereto. For example, such a spring band may be provided withwindow-like cutouts formed therein, whereby the Webs between the cutoutscan be used for fastening the armatures, the latter lying within thewindow-like contacts of the spring strip.

Accordingly, the number of individual parts required for theconstruction of the relay set can be reduced to a far reaching extent,thereby resulting in simplification of the fabrication.

Further details and features of the invention will be brought out in thedescription which is rendered below with reference to the accompanyingdrawings, showing embodiments thereof.

FIG. 1 shows in cross-sectional representation a relay according to theinvention, comprising a plate in which is positioned a core, and a coverdisposed upon the plate and forming therewith a closed space for thearmature, a boss being formed on the cover, for engagement with thearmature in the normal positionthereof; a

FIG. 2 is an elevational view of the inside of the cover and thearmature means cooperating therewith;

FIG. 3 represents in cross-sectional view a relay similar to the oneshown in FIG. 1, but having a pin projecting through the cover forengagement with the armature in the normal position thereof;

FIG. 4 illustrates in cross-sectional representation a relay providedwith two cores;

FIG. 5 indicates in cross-sectional view a relay according to theinvention comprising two magnetically and electrically conductive coresand a contact element which is only electrically conductive andcooperates with the armature;

FIG. 6 shows in cross-sectional representation a relay set or barprovided with relays constructed according to the invention, thearrangement being such that the armatures of the relays extend seriallyas viewed in longitudinal direction of the set;

, FIG. 7 is a cross-sectional transverse view taken along lines I--I ofFIG. 6; and 7 FIG. 8 represents an interior view of the cover employedin the relay set shown in FIGS. 6 and 7.

The arrangement shown in FIG. 1 comprises a metallic plate 1 and a core2, the latter being sealed gastight in position by a seal 3 of glass orsimilar material. The inner end 4 of the core 2, which is sphericallyformed, is flush with the inner plane of the plate 1. Numeral 10indicates a cover having a flange 11 disposed in a marginal depressionformed in the plate. The cooperation of these parts determines theaccurate position of the cover on the plate. The cover is made of metaland is hermetically tightly welded to the plate.

Numeral 13 indicates the armature which is by means of a spring 12journalled on the cover, inside thereof, the opposite ends of the spring12 being Welded to the cover and to the armature, respectively. Thearmature is in the normal position thereof in engagement with a boss i4,formed by indentation of the cover and inwardly projecting therefrom atan area aligned with the core 2.

Upon the outwardly extending portion of the core 2 is disposed theenergizing winding or coil 6. Numeral 7 indicates a yoke plate having ahole formed therein through which the core projects as shown. A fluxconducting member 8 extending in parallel with the core 2 is disposedbetween the yoke plate 7 and the core plate 1.

The armature 13 is attracted by the core responsive to energization ofthe winding 6, appropriate electrical circuit connections being ofcourse provided in this as well as in all other embodiments, and thearmature accordingl engages the spherically shaped end 4- of the core.Since the armature 13 is over the spring 12 electrically conductivelyconnected with the metallic cover, there will be closed a circuit whichis by suitable means connected respectively with the core and the plateor the cover. With appropriate construction of the relay, the armaturewill not only engage the core but also part of the surface 5 of theplate 1, thereby establishing a circuit extending over the spring andthe armature between the plate and the core.

The area of the armature which establishes contact engagement with thecore and also the corresponding area or point of the cover, may becoated with a contact material of noble metal, for example, silver. Thesame applies for the surface 5 of the plate and the surface of thearmature cooperating therewith.

The. free outer end of the core projects through a hole formed in aninsulating plate 15 which carries a conductor 16 printed thereon. Thisconductor is soldered to the core, for example, by immersion soldering,thereby establishing an electrical connection between the conductor andthe core, such connection also serving for fastening the relay in placeon the insulating plate 15.

The armature is constructed of two independent parts, as shown in FIG.2, which are soldered to extensions 17 and 18 of the armaturejournalling spring 12, the latter being welded to the cover as alreadydescribed.

Parts in FIG. 3 which correspond to identical parts shown in FIG. 1, areidentically referenced. The cover 35 is in FIG. 3 made of non-magneticmetal, through the wall of which extends in gastight manner amagnetically conductive pin 9, such pin being, for example, welded tothe wall of the cover. The armature is in the normal position thereof,in engagement with the inner end of the pin 9. A coil or winding 21} isprovided on the outwardly protruding part of the pin 9. Accordingly, theoperation of the armature can be controlled by the action of the coil 20additionally to the action of the coil 6.

The core 22 is at its upper end provided with an enlargement 19, suchenlargement facilitating the fusing operation of the seal 3 andpreventing the flow of the sealing material beyond the space extendingbetween the core 22 and the plate 36.

The relay shown in FEG. 4 is. provided with two cores 23 and 24, whichare at 34 sealed gastight in position in the metallic plate 21.Journalled in the core 24, by means of a spring 25, is the armature 26which also serves as electrical conductor. Upon the plate 21 is placedthe cover 27, having a boss 28 formed therein, for example u a byindentation thereof, the armature being in its'normal position inengagement with this boss. The metallic core 27 is hermetically tightlywelded to the plate 21. Upon the core 23 is provided an energizingwinding 29. Numeral 3d indicates a yoke plate for magneticallyinterconnecting the cores 23 and 24. The cores extend through holesformed in the yoke plate, and the free ends of the cores are pluggedinto holes formed in the insulating plate 31 which is provided withprinted conductors such as 32 and 33. The free outer ends of the coresare soldered to these conductors, thereby forming electricalconnectionsand serving also for holding the relay in position on theprinted circuit plate.

The example illustrated in FlG. comprises a plate 35 carrying inaddition to two cores 36 and 37, whichserve as electrical and magneticconductors, a member 38 which forms a solely electrically conductivecontact ele-' ment for cooperation with the armature 39. The armature 39is slightly V-shaped and tiltably journalled upon the centrally disposedcore 36 by means of a spring 49. Upon the centrally disposed core isprovided the magnetizing winding or coil 41. The armature 39 is disposedin a closed chamber formed by the cover 32 in cooperation with the plate35. The cores 36 and 37 are magnetically interconnected by a yoke plate43.

In the normal position of the relay, the spring 42'; holds the armature39 in contact engagement With the core 37, thereby establishingconnection between the cores 37 and 36. Upon energization of themagnetizing winding 41, the armature is tilted to its alternateposition, breaking 1 engagement with the core 37 and establishing aconnecof the plate 44. The cores are secured in position by V fusedglass seals 61. To each relay is assigned a core 45. Upon the plate 44is disposed. a cover 46 which is connected hermetically tight therewith.A. spring strip or band is welded to the cover on the inside thereof,such spring strip carrying the relay armatures, the respective armaturesbeing made of two parts 43 and 49 which are welded to extensions 59 and51 of the spring strip. The corresponding welding spots are indicated at52 and 53.

u The connecting points between the spring strip and the cover areindicated by numeral 54. The spring strip extensions 5t), 51 project inthe case of all relays; except the lowermost relay, into window-likecutouts 55 formed in the spring strip 47. The spring strip presses eacharmature against a boss 56 projecting inwardly from the cover 46 inalignment with the'corresp'onding .core.

a The bosses 56 may be made in the form of indentations or maybe in theforms of pins extending through the cover. 7

Upon each core 45 is provided a magnetizing winding or coil 57. Thecores are magneticallyinterconnected by means of a yoke plate 58 whichis common to all relays of the set, the various cores projecting throughholes in the yoke plate without establishing electrical connectionstherewith; Magneticallyilconductive members such as 62 are providedbetween the core plate 44 and the yoke plate 53, such members extendingin parallel with the respective cores. The free outer 'ends of the 1cores are plugged intoan insulating plate 59 which is provided withprinted conductors 69 to which the cores can be connected by soldering;

Upon energization of a magnetizing winding, there will be produced aflux, such as is indicated by arrows in connection with one of therelays shown in FIG. 6. The corresponding'armature is accordinglyattracted and proinvolved core and the cover, and the plate by contactongagement of the armature with the core-and plate, such connectionextending over the restoring spring of the reduces an electricalconnection respectively'b'etweenthe V 8 spective armature. Therefore, acircuit is closed which extends over the plate and the respective core.A terminal connected to the plate is common to all relays of the relayset. 7

Upon using a plurality of cores for each individual relay, it will ofcourse be possible to control with such relay completely separatecircuits, whereby the core plate 4 5 does not serve as an electricalconductor.

It is of course understood that the circuitry required in all aspects oftherelays may be provided in accord ance with known and Well understoodteaching. Changes may be made within the scope and spirit of theappended claims which define what is believed to be new and desired tohave protected by Letters Patent.

We claim:

1. An electromagnetic relay, comprising a magnetizable electricallyconductive core, a magnetizing winding carried by and electricallyinsulated from .said core, a carrier for said core'in the form of aplate having substantially rectangular cross section, said core being ofpin-like configuration and inseparably secured in electrically insulatedrelation with respect to said carrier, said pin core extendingperpendicularly to the plane of said carrier plate, a magnetizablearmature, disposed at one side of said carrier, having a part disposedopposite said core and cooperable' therewith to form operative contactsof the relay, the surface of the carrier at the armature side thereofforming a reference planefor the disposition of the armature, the core,engaging portions of the contacts, and associated relay parts, and thesurface of the opposite side of the carrier forming a reference planefor the magnetizing winding, and means forming a flux return pathbetween said core and carrier, the armature being disposed for directopposition to the core contacted thereby and'a part of the platesurface, to act as a part which carries the operatively effectivemagnetic flux.

2. An electromagnetic relay according to claim 1, wherein the carrierplate is formed of magnetizable metal, the core being hermeticallyinserted in sealing engagement with the-aid of electrically insulatingbodies of ceramic, the hermetically tight insertion being effectedaccording to thepressure-glass-fusing technique,

3. An electromagnetic relay according to claim 2, wherein a cover isdisposed upon the carrier plate, said cover cooperating with said plateto form a sealed space for the armature.

4. An electromagnetic relay according to claim. 3,

wherein the cover is at least partially made of metal and the armatureeffects in its working position contact be tween the cover and theoperating core. 7 j

5. An electromagnetic relay according to claim 2, wherein there is onlyone core inserted in the carrier plate a and the armature effectscontact inits operating position,

between the carrier plate and the core. 2

6. An electromagnetic relay according I to claim 3,

'wherein the cover has an extension which projects'into 8. {inelectromagnetic relay according 'to claim 7, wherein the pin is made ofmagnetizable material and carries at least one winding. V

' 9. A relay set comprising a. plurality of electromagnetic relaysaccording to claim 3, wherein the relay set has a common carrier platetaking the place of the carrier plates of the individual relays, inwhich common plate' are inserted the cores of .all'relays, at least onefluxconducting piece being associated with each core and ar-Lranged'parallel .to the part of the associated core which carries theenergizing winding, said flux-conducting piece being connectedmagnetically with such coreby a yoke plate which extends'parallel to thecarrier plate, the cover and yoke plate being respectively formed as acommon cover and common yoke plate at least for a part of the relays ofthe relay set.

10. A relay set according to claim 9, wherein the armatures of at leastpart of the relays combined in the relay set, are journelled by way of aspring band which is common thereto.

11. A relay set according to claim 10, wherein the common spring bandwhich carries the armatures, is provided with window-like cutouts formedtherein, extensions for fastening the armatures being arranged on theWebs of the spring band which separate the cutouts formed therein.

12. An electromagnetic relay according to claim 1, wherein the armatureis formed of two mutually independent parts lying one next to the other,said parts being fastened to extensionsof a spring.

13. An electromagnetic relay according to claim 1, wherein contactelements cooperating with the armature are inserted into the samecarrier plate in which is inserted at least one magnetizable core whichalso serves as an electrical conductor, said contact element servingonly as electrical conductors and being constructed in the same manneras the core and inserted in the plate.

14. An electromagnetic relay according to claim 1, wherein said meansforming a flux return path comprises at least one flux-conducting piecearranged parallel to the part of the core which carries the energizingwinding, said flux-conducting piece being connected magnetically withthe core by a yoke plate which extends parallel to the carrier plate.

15. An electromagnetic relay according to claim 14, wherein theflux-conducting piece is formed as a core member which is inserted intothe carrier plate, the armature of the relay being journailed upon suchcore member.

16. A relay set comprising a plurality of electromagnetic relaysaccording to claim 1, wherein the relay set has a common carrier platetaking the place of the carrier plates of the individual relays, inwhich common plate are inserted the cores of all relays.

References Cited in the file of this patent UNITED STATES PATENTS2,933,571 Howell Apr. 19, 1960 2,972,032 Persson Feb. 14, 1961 3,053,953Braumann Sept. 11, 1962 3,056,869 Dal Bianco et al. Oct. 2, 19623,078,359 Braumann Feb. 19, 1963

1. AN ELECTROMAGNETIC RELAY, COMPRISING A MAGNETIZABLE ELECTRICALLYCONDUCTIVE CORE, A MAGNETIZING WINDING CARRIED BY AND ELECTRICALLYINSULATED FROM SAID CORE, A CARRIER FOR SAID CORE IN THE FORM OF A PLATEHAVING SUBSTANTIALLY RECTANGULAR CROSS SECTION, SAID CORE BEING OFPIN-LIKE CONFIGURATION AND INSEPARABLY SECURED IN ELECTRICALLY INSULATEDRELATION WITH RESPECT TO SAID CARRIER, SAID PIN CORE EXTENDINGPERPENDICULARLY TO THE PLANE OF SAID CARRIER PLATE, A MAGNETIZABLEARMATURE, DISPOSED AT ONE SIDE OF SAID CARRIER, HAVING A PART DISPOSEDOPPOSITE SAID CORE AND COOPERABLE THEREWITH TO FORM OPERATIVE CONTACTSOF THE RELAY, THE SURFACE OF THE CARRIER AT THE ARMATURE SIDE THEREOFFORMING A REFERENCE PLANE FOR THE DIS-